H3C CH3 CH3 "ОН COOH CH3 Circle the isoprene units in abscisic acid. State the class of the terpene. Predict the significant infrared absorption frequencies for abscisic acid. Give the product when abscisic acid is treated with: i. ii. 111. iv. LIAIH4. CH:QH, H". 1. 2.
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- Give the pharmacological property of the following terpenes/terpenoids. Where do they naturally occur? saponins terpenoids cardiac glycosides How can terpenes/terpenoids be extracted from plants? What are the chemical tests used in identifying the presence of cardiac glycosides?Homopolysaccharide are found abundant in nature. Explain how this class ofpolysaccharide acts as primary component of plants and insects.Draw the Fischer projection formula for each sugar and give the importance/use of each. 1. D- glyceraldehyde 2. D- erythrose 3. D- ribose 4. D- deoxyribose 5. D- glucose 6. D- galactose 7. D- fructose 8. D- ribulose
- Draw the structure of two different aldohexoses that yield the followingaldaric acid when oxidized with HNO3. Use Figure to name eachaldohexoseWrite an equation for the esterification of glycerol withthree molecules of myristic acidGentiobiose has the molecular formula C12H22O11 and has been isolated from gentian root and by hydrolysis of amygdalin. Gentiobiose exists in two different forms, one melting at 86°C and the other at 190°C. The lower melting form is dextrorotatory ([α] 16°), the higher melting one is levorotatory ([α] -6°). The rotation of an aqueous solution of either form, however, gradually changes until a final value of [α] 9.6° is observed. Hydrolysis of gentiobiose is efficiently catalyzed by emulsin and produces two moles of D-glucose per mole of gentiobiose. Gentiobiose forms an octamethylether, which on hydrolysis in dilute acid yields 2,3,4,6-tetra-O-methyl-D-glucose and 2,3,4-tri-O-methyl-D-glucose. What is the structure of gentiobiose? EXPLAIN IN DETAIL.
- The reverse synthesis of ceramides synthesized biologically from sphingosine is possible. 1. What type of reaction would this be? 2. How would the pH of the skin where this reaction is most likely to take place affect this reaction?Sorbital sugar has two namesDevelop the biosynthesis (from the malonyl-CoA unit) of the condensed tannin monomeric unit present in the Maytenus ilicifolia species, which has medicinal use already recognized in the scientific literature. Highlight in the structure the portion coming from the biosynthetic pathway of shikimic acid and number (rings and atoms).
- We have seen one of the four possible isomers of isocitrate, the one produced in the aconitase reaction. Draw the configurations of the other three.The following structure is sorbose Answer the following questions and briefly explain Draw β-D-sorbufuranose Draw β-D-sorbufuranosyl(2->1) β-D-glucopyranoside. Is this reducing sugar? What would be the probable function of this disaccharide, structural or storage?Given the following choices,a. structure of sterolb. what is the structure of a glycolipid?